Ukrainian recruits line up as they receive military instructions from a commander at a recruitment center in Kiev's Independence Square, Ukraine, Tuesday, March 4, 2014. Vladimir Putin ordered tens of thousands of Russian troops participating in military exercises near Ukraine's border to return to their bases as U.S. Secretary of State John Kerry was on his way to Kiev. Tensions remained high in the strategic Ukrainian peninsula of Crimea with troops loyal to Moscow fired warning shots to ward off protesting Ukrainian soldiers. (AP Photo/Emilio Morenatti)
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